CN100345926C - Fast-speed lakh bleaching and antichlorating method - Google Patents
Fast-speed lakh bleaching and antichlorating method Download PDFInfo
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- CN100345926C CN100345926C CNB2004100795679A CN200410079567A CN100345926C CN 100345926 C CN100345926 C CN 100345926C CN B2004100795679 A CNB2004100795679 A CN B2004100795679A CN 200410079567 A CN200410079567 A CN 200410079567A CN 100345926 C CN100345926 C CN 100345926C
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- shellac
- bleaching
- glue
- chlorine
- dechlorination
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Abstract
The present invention provides a fast bleaching and dechlorination method with shellac. In the method, shellac, soda and water are mixed, heated to 75 to 95 DEG C, dissolved into a shellac alkaline solution whose concentration is smaller than 25%, is filtered and is held at 75 to 95 DEG C; the obtained shellac alkaline solution is stirred at a 50 to 90 r/min, a chlorine-contained bleaching agent is simultaneously added to make the effective chlorine content be from 15 22 wt%, and stirring is carried out for 30 to 40 min to obtain a bleaching shellac solution; temperature raises to 85 to 95 DEG C, and stirring is carried out for 3 to 8 min at 50 to 90 r/min to obtain a dechloridized shellac solution. In the method, bleaching time is reduced by 50%, the chlorine content of a product is below 1%, storage time is effectively extended, and the dilution of sodium hypochlorite and a device for the dilution are omitted; in addition, the quality of a product is stable, the shelf life is long, the color of a use object can not be changed or influenced in use, and thereby, the application range of bleaching shellac in various kinds of industry is effectively widened.
Description
Technical field
The present invention relates to the method for a kind of bleaching and dechlorination, especially a kind of method that shellac is carried out rapid bleach and dechlorination belongs to Chemicals processing and processing technology field.
Background technology
Shellac is the stronger resin of a kind of bounding force.Lac resin is to be the vibrin that the alcohol acid of 300-3000 is derived and formed by molecular weight, mainly is made up of tung oil tree acid and shelloic acid, contains materials such as wax and pigment in addition.Except that bounding force, lac resin also has electrical insulation capability, water resistance, protection against the tide and rustless property, ultraviolet resistance and oil resistant, acid resistance preferably, and to human body nontoxicity and pungency, and plasticity-is strong, fixing property is good or the like, therefore be widely used in agricultural, light industry, heavy industry produce in and in people's the daily necessitiess such as eating, wear, use, related purposes reaches more than 200 more than the kind.With regard to industrial use, mainly be used in coating, woodenware, molding, hatting, clothes, medicine and foodstuffs industry, insulation, papermaking, printing ink, national defense industry etc., particularly in recent years because people are more and more higher to the requirement of food safety, therefore, in medicine, foodstuffs industry and association area thereof, people pay close attention to or the Green Product of demand pure natural more.And will substitute chemical industry synthetic resins as the shellac of pure natural resin, make it to become medicine film dressing, fruit and vegetable coating is fresh-keeping, food is moistureproof preferred raw materials.For satisfying above-mentioned industrial requirement, used shellac must have does not influence the color of using object, and insulating property are superior, viscosity and water-soluble characteristics such as stronger.This just requires the shellac color shallow as far as possible, and wax content is low.But present existing bleached shellac or refined bleached shellac (dewaxing bleaching glue) are owing to be subjected to the restriction of bleaching method in the existing technology, making residually in the glue after the bleaching has a large amount of free chlorines, and that residual free chlorine easily makes it in the shellac storage process is rotten, thereby influences the shellac quality product.In addition, it is long that existing complete processing also exists bleaching time, poor continuity, and production unit is many, cost height, the low deficiency that waits of production efficiency.Therefore, be necessary prior art is improved.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of technology is simple, production cost is low, efficient Gao Bingneng deviates from free chlorine the shellac rapid bleach and the method for dechlorination are provided.
The present invention realizes by following technical proposal: the method for a kind of shellac rapid bleach and dechlorination is characterized in that comprising following process steps:
A, in shellac, add soda ash and water post-heating to 75～95 ℃, make it to be dissolved into the shellac alkaline solution of concentration, filter waste, and constant temperature is at 75～95 ℃ less than 25% mass ratio;
B, by the speed of 50-90r/min the temperature of gained is remained on 75～95 ℃ shellac alkaline solution and stir, add chlorine bleaching agent simultaneously, making available chlorine content is 15～22% mass ratio, stirs 30-40min, must bleach glue;
C, above-mentioned bleaching glue is warming up to 85～95 ℃, and the speed of pressing 50-90r/min stirs 3～8min, makes the clorox decomposes, the dechlorination glue;
D, with above-mentioned dechlorination glue dewax, add acid neutralization, filtration washing gets granular bleaching glue, pass through compressing tablet, drying again after, promptly get the bleached shellac product.
The dewaxing of described D step, add acid neutralization, filtration washing, compressing tablet, drying are technological process of the prior art.
Described chlorine bleaching agent is commercially available clorox, perhaps chlorine, perhaps liquid chlorine, perhaps dioxide peroxide.
Described shellac is commercially available seed lac or sheet glue or without the shellac of bleaching.
Method provided by the invention all is suitable for market bleach glue and refined bleached shellac.
The present invention compared with prior art has following advantage and effect: adopt such scheme, shortened 50% bleaching time, and realized the continuity of production technique, and through after the heating dechlorination, the product cl content is below 1%, 20 ℃ of condition following storage periods were greater than 18 months, than the extended pot life of the product of existing explained hereafter 8 months, and clorox needn't dilute for available chlorine content be 5%, can directly bleach by clorox commodity inherent available chlorine content, saved the diluent facilities of dilution clorox, therefore, be that a technical process is short, bleaching time is short, save facility investment, constant product quality, the shellac of long quality-guarantee period is bleached and dechlorination process, can not change or influence the color of use object in use with the bleached shellac of this explained hereafter, and have superior insulating property, viscosity and characteristics such as water-soluble, thus the range of application of bleached shellac in every profession and trade effectively increased.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
A, get shellac, and add water, by in being enough to and the amount of shellolic acid add alkali, stirring also is heated to 75 ℃, and making shellac be dissolved into concentration is the following shellac alkaline solution of 25% mass ratio, carries out coarse filtration with scalping, waste gets the coarse filtration glue, carry out fine filtering with dusting cover again, waste gets the fine filtering glue, and makes glue constant temperature at 80 ℃;
B, with the glue of above-mentioned constant temperature at 80 ℃, stir by the speed of 50r/min, add commercially available clorox simultaneously, making available chlorine content is 15% mass ratio, stir 40min after, promptly finish the bleaching of shellac and must bleach glue;
C, above-mentioned gained bleached shellac liquid is warming up to 85 ℃, and the speed of pressing 90r/min stirs 3min, makes the clorox decomposes, promptly finish bleached shellac dechlorination and the dechlorination glue;
D, with above-mentioned dechlorination glue with existing processing method dewax, add acid neutralization, filtration washing gets granular bleaching glue, pass through compressing tablet, drying again after, promptly get the bleached shellac product.
Embodiment 2
A, get shellac, and add water, by in being enough to and the amount of shellolic acid add alkali, stirring also is heated to 80 ℃, and making shellac be dissolved into concentration is the following shellac alkaline solution of 25% mass ratio, carries out coarse filtration with scalping, waste gets the coarse filtration glue, carry out fine filtering with dusting cover again, waste gets the fine filtering glue, and makes glue constant temperature at 80 ℃;
B, by the speed of 90r/min the temperature of gained is remained on 80 ℃ shellac alkaline solution and stir, add the ClO 2 bleaching agent simultaneously, making available chlorine content is 22% mass ratio, stirs 30min, must bleach glue;
C, above-mentioned bleaching glue is warming up to 80 ℃, and the speed of pressing 50r/min stirs 8min, makes the dioxide peroxide decomposes, the dechlorination glue;
D, with above-mentioned dechlorination glue dewax, add acid neutralization, filtration washing gets granular bleaching glue, pass through compressing tablet, drying again after, promptly get the bleached shellac product.
Embodiment 3
A, get shellac, and add water, by in being enough to and the amount of shellolic acid add alkali, stirring also is heated to 90 ℃, and making shellac be dissolved into concentration is the following shellac alkaline solution of 25% mass ratio, carries out coarse filtration with scalping, waste gets the coarse filtration glue, carry out fine filtering with dusting cover again, waste gets the fine filtering glue, and makes glue constant temperature at 90 ℃;
B, by the speed of 70r/min the temperature of gained is remained on 90 ℃ shellac alkaline solution and stir, add the liquid chlorine SYNTHETIC OPTICAL WHITNER simultaneously, making available chlorine content is 22% mass ratio, stirs 35min, must bleach glue;
C, above-mentioned bleaching glue is warming up to 95 ℃, and the speed of pressing 80r/min stirs 5min, makes the liquid chlorine decomposes, the dechlorination glue;
D, with above-mentioned dechlorination glue dewax, add acid neutralization, filtration washing gets granular bleaching glue, pass through compressing tablet, drying again after, promptly get the bleached shellac product.
Claims (4)
1, the method for a kind of shellac rapid bleach and dechlorination is characterized in that comprising following process steps:
A, in shellac, add soda ash and water post-heating to 75～95 ℃, make it to be dissolved into the shellac alkaline solution of concentration, filter waste, and constant temperature is at 75～95 ℃ less than 25% mass ratio;
B, by the speed of 50-90r/min the temperature of gained is remained on 75～95 ℃ shellac alkaline solution and stir, add chlorine bleaching agent simultaneously, making available chlorine content is 15～22% mass ratio, stirs 30-40min, must bleach glue;
C, above-mentioned bleaching glue is warming up to 85～95 ℃, and the speed of pressing 50-90r/min stirs 3～8min, makes the clorox decomposes, the dechlorination glue;
D, with above-mentioned dechlorination glue dewax, add acid neutralization, filtration washing gets granular bleaching glue, pass through compressing tablet, drying again after, promptly get the bleached shellac product.
2, method according to claim 1, it is characterized in that described D step dewaxing, add acid neutralization, filtration washing, compressing tablet, drying are technological process of the prior art.
3, method according to claim 1 is characterized in that described chlorine bleaching agent is commercially available clorox, perhaps chlorine, perhaps liquid chlorine, perhaps dioxide peroxide.
4, method according to claim 1 is characterized in that described shellac is commercially available seed lac or sheet glue or without the shellac of bleaching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100795679A CN100345926C (en) | 2004-11-18 | 2004-11-18 | Fast-speed lakh bleaching and antichlorating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100795679A CN100345926C (en) | 2004-11-18 | 2004-11-18 | Fast-speed lakh bleaching and antichlorating method |
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| Publication Number | Publication Date |
|---|---|
| CN1778853A CN1778853A (en) | 2006-05-31 |
| CN100345926C true CN100345926C (en) | 2007-10-31 |
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| CNB2004100795679A Expired - Fee Related CN100345926C (en) | 2004-11-18 | 2004-11-18 | Fast-speed lakh bleaching and antichlorating method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191034B (en) * | 2007-11-16 | 2011-08-31 | 杨儒林 | Preparation method for bleaching lacca |
| CN101215444B (en) * | 2008-01-03 | 2011-10-26 | 中国林业科学研究院资源昆虫研究所 | Method for reclaiming bleaching lac particles |
| CN101705053B (en) * | 2008-01-03 | 2013-01-23 | 中国林业科学研究院资源昆虫研究所 | Bleached lac particle recovering method |
| CN102408832B (en) * | 2011-08-17 | 2013-11-27 | 昆明理工大学 | Method for beaching shellac using chlorine dioxide and alcohol solvent, and application thereof |
| CN110862771A (en) * | 2019-12-04 | 2020-03-06 | 安宁戴科精细化工有限公司 | Preparation method of less-chlorine refined bleached lac |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072437A (en) * | 1992-06-21 | 1993-05-26 | 中国林业科学研究院资源昆虫研究所 | A kind of production method of bleached shellac |
| US6348217B1 (en) * | 2000-08-04 | 2002-02-19 | Mantrose-Haeuser Co. Inc. | Method for preparing stable bleached shellac |
| CN1377592A (en) * | 2002-04-24 | 2002-11-06 | 陈东海 | Refined edible lac and its preparing method |
| CN1472274A (en) * | 2003-06-03 | 2004-02-04 | 中国林业科学研究院资源昆虫研究所 | Dechlorination of bleaching shellac |
-
2004
- 2004-11-18 CN CNB2004100795679A patent/CN100345926C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072437A (en) * | 1992-06-21 | 1993-05-26 | 中国林业科学研究院资源昆虫研究所 | A kind of production method of bleached shellac |
| US6348217B1 (en) * | 2000-08-04 | 2002-02-19 | Mantrose-Haeuser Co. Inc. | Method for preparing stable bleached shellac |
| CN1377592A (en) * | 2002-04-24 | 2002-11-06 | 陈东海 | Refined edible lac and its preparing method |
| CN1472274A (en) * | 2003-06-03 | 2004-02-04 | 中国林业科学研究院资源昆虫研究所 | Dechlorination of bleaching shellac |
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| CN1778853A (en) | 2006-05-31 |
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